To my experience, it takes a random amount of time for the withdrawal to be executed. I had a withdrawal more than a week before you, and I received the confirmation (saying the transfer is made) before the 7th and still haven't received the money. So I guess you are out of luck until the issues are totally cleared.
ETA: So you should be worried. Please post here if you get any information out of this service.
You do realize bitcoin24 has some problems with authority right now, don't you? Locked bank accounts and whatnot. I wouldn't be surprised if the owner just poofs and disappears.